Method and system for diagnosing an aftertreatment system

The present invention relates to a method for diagnosing aftertreatment of exhaust gases resulting from combustion, wherein at least a first substance (N0resulting from said combustion is reduced by supplying additive to an exhaust gas stream resulting from said combustion and use of a first reducti...

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Bibliographische Detailangaben
Hauptverfasser:	Carl Wahlström, Mikael Lundström, Sebastian Zamani
Format:	Patent
Sprache:	eng ; swe
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	The present invention relates to a method for diagnosing aftertreatment of exhaust gases resulting from combustion, wherein at least a first substance (N0resulting from said combustion is reduced by supplying additive to an exhaust gas stream resulting from said combustion and use of a first reduction catalytic converter (201). The method includes:- estimating an accumulated expected reduction of said first substance (NOduring a first period of time (t1im1),- determining an accumulated actual reduction of said first substance (NOduring a period of time at least substantially corresponding to said first period of time (t1im1), and- generating a signal indicating a fault in said reduction of said first substance (NOwhen said accumulated actual reduction differs from said accumulated expected reduction by a predetermined difference in occurrence of said first substance (NO. The invention also relates to a corresponding system.Fig. 3