Title:
排出ガスの清浄化と共に窒素酸化物類、炭化水素類及び一酸化炭素の濃度を制御する方法
Document Type and Number:
Japanese Patent JP2004508158
Kind Code:
A
Abstract:
A method of controlling the concentration of nitrogen oxides, hydrocarbons, and carbon monoxide in waste gases. A first lambda value (lambda1) 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 (lambda2) 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 (lambda2) lies within a predetermined range whose lower limit is higher than 1.
Inventors:
Lindskog, Nils
Application Number:
JP2001582697A
Publication Date:
March 18, 2004
Filing Date:
March 23, 2001
Export Citation:
Assignee:
Sandvik Activola Get
International Classes:
F02D45/00; B01D53/86; B01D53/94; F01N3/10; F01N3/22; F01N11/00; F01N13/00; F01N13/02; (IPC1-7): B01D53/86; F01N3/10; F01N3/22; F02D45/00
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Katsunori Ando
Yukihiro Ikeda
Hajime Asamura
Katsunori Ando
Yukihiro Ikeda