Method for operating an exhaust-gas treatment device of an...

Details Method for operating an exhaust-gas treatment device of an... Method for operating an exhaust-gas treatment device of an...

2005-10-20

2009-11-17

Mayes, Melvin C (Department: 1793)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S298000, C060S301000

Reexamination Certificate

active

07617674

ABSTRACT:
A method for operating an exhaust-gas treatment device of an internal combustion engine and a device for carrying out the method, in which a reagent, whose pressure is measured by a reagent pressure sensor, is introduced into the exhaust-gas area upstream from the exhaust-gas treatment device. First the reagent pressure is brought to the exhaust-gas pressure which prevails in the exhaust-gas area upstream from the exhaust-gas treatment device. Then the pressure difference between the reagent pressure and the sum of the exhaust-gas pressure and the ambient air pressure is compared to a predefined pressure difference threshold, and if the pressure difference threshold is exceeded an error signal is supplied. The procedure contributes to an exact metering of the reagent through a diagnosis of the reagent pressure sensor.

REFERENCES:
patent: 6209313 (2001-04-01), Wissler et al.
patent: 6519935 (2003-02-01), Weigl
patent: 6637196 (2003-10-01), Tost
patent: 2003/0074891 (2003-04-01), Tamura et al.
patent: 2003/0167756 (2003-09-01), Szymkowicz
patent: 2004/0011027 (2004-01-01), Hirooka et al.
patent: 101 39 142 (2003-02-01), None

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