Method of controlling the concentration of nitrogen oxides, hydrocarbons and carbon monoxide in conjunction with the cleansing of emission gases
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United States of America Patent
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Aug 30, 2005
Grant Date -
Jul 31, 2003
app pub date -
Mar 23, 2001
filing date -
Apr 19, 2000
priority date (Note) -
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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 NOx to 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 CO2 and 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.
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