Système de post-traitement des gaz d'échappement

Exhaust aftertreatment system

Abgasnachbehandlungssystem

Abstract

A particulate filter (12) integrally carrying an oxidation catalyst is arranged in an exhaust pipe (9) through which exhaust gas from a diesel engine flows (1). A NO x -absorption reduction catalyst (11) is arranged in the exhaust pipe (9) and downstream of the particulate filter (12). A bypass line (17) is branched from a portion of the exhaust pipe (9) between the particulate filter (12) and the reduction catalyst (11) and is connected to a portion of the exhaust pipe (9) downstream of the reduction catalyst (11). A selector valve (18) is arranged at the branch point of the bypass line (17) and may be switched over to guide the exhaust gas either to the reduction catalyst (11) or to the bypass line (17). As a result, without difficultly controlling the operation of the diesel engine (1), the reduction catalyst (11) is prevented from being poisoned and deteriorated by sulfate, the lowering of the ratio of NO x purification through the NO x -absorption reduction catalyst (11) is averted and prolongation of its life is attained.

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Patent Citations (5)

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NO-Patent Citations (2)

    Title
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    DE-102010033689-A1March 03, 2011Umicore Ag & Co. KgAbgasnachbehandlungssystem mit katalytisch aktivem Wall-Flow-Filter mit NOx-Speicherfunktion vor Katalysator mit gleicher Speicherfunktion
    EP-2039898-A1March 25, 2009Deere & CompanyFiltre à particules à régénération continue pour moteur à combustion interne
    EP-2924257-A1September 30, 2015Umicore AG & Co. KGAbgasnachbehandlungssystem mit katalytisch aktivem Wandstromfilter mit Speicherfunktion vor einem katalytischen Konverter mit identischer Speicherfunktion
    US-8475753-B2July 02, 2013Umicore Ag & Co. KgExhaust-gas aftertreatment system with catalytically active wall-flow filter with storage function upstream of catalytic converter with identical storage function
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    WO-2013087784-A1June 20, 2013Avl List GmbhInternal combustion engine
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