Method for controlling injection of reducing agent in...

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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C060S274000, C060S286000, C060S295000, C060S301000, C060S303000

Reexamination Certificate

active

11288152

ABSTRACT:
The invention relates to a method for controlling injection of a reductant into a NOxcontaining exhaust gas stream from a combustion engine, where combustion of a known fuel takes place and where the NOxis reduced by selective catalytic reduction, SCR, in the presence of a SCR catalyst, comprising establishing signals related to exhaust gas flow, HOxconcentration in the exhaust gas stream upstream of the catalyst, exhaust gas temperature upstream of the SCR catalyst, exhaust gas temperature downstream of the SCR catalyst and to input data for catalyst characteristics. From the signals an adjusted amount of the reductant is calculated by using a calculated amount of reductant and a value d(E*T)/dt, where E is the exhaust gas flow, T is the exhaust gas temperature upstream of the catalyst and t is time.

REFERENCES:
patent: 5628186 (1997-05-01), Schmelz
patent: 5950422 (1999-09-01), Dolling
patent: 6119448 (2000-09-01), Emmerling et al.
patent: 6415602 (2002-07-01), Patchett et al.
patent: 6427439 (2002-08-01), Xu et al.
patent: 6532736 (2003-03-01), Hammerle et al.
patent: 7065958 (2006-06-01), Funk et al.

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