Method of controlling the concentration of nitrogen oxides,...

Details Method of controlling the concentration of nitrogen oxides,... Method of controlling the concentration of nitrogen oxides,...

2005-08-30

2005-08-30

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S289000, C060S299000

Reexamination Certificate

active

06935102

ABSTRACT:
A method of controlling the concentration of nitrogen oxides, hydrocarbons, and carbon monoxide in waste gases. A first lambda value (λ1) of the air-fuel mixture is set to less than 1. The gases pass through a first catalyst and then through a second catalyst. The CO-concentration of the gases in the first catalyst is sufficiently high to reduce NOxto N2so that the NOx concentration is reduced to a predetermined value. Oxygen (O2) is introduced between the first catalyst and the second catalyst to oxidize both CO and HC to CO2and H2O, to reduce the CO-concentration to a predetermined value. A second lambda value (λ2) is measured in the gases downstream of the second catalyst, and a valve for regulating the air-fuel ratio is controlled so that the second lambda value (λ2) lies within a predetermined range whose lower limit is higher than 1.

REFERENCES:
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patent: 5235956 (1993-08-01), Yoshizaki
patent: 5293740 (1994-03-01), Heppner et al.
patent: 5551231 (1996-09-01), Tanaka et al.
patent: 5746049 (1998-05-01), Cullen et al.
patent: 0 555 936 (1993-08-01), None
patent: WO 99/20375 (1999-04-01), None

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