Title:
排気浄化制御装置
Document Type and Number:
Japanese Patent JP3613083
Kind Code:
B2
Abstract:
An apparatus for purifying and controlling exhaust gases having NOx adsorption catalyst in the exhaust gas duct therein, and conducting exhaust gas purification by adsorbing or capturing NOx in the oxidative atmosphere of lean exhaust gas, producing a reductive atmosphere and regenerating the adsorption catalyst, characterized by carrying out a reduction treatment of NOx on the basis of a calculated quantity of adsorbed NOx, said calculated quantity of adsorbed NOx being obtained by subtracting the quantity of NOx directly reduced to N2 from the total NOx in exhaust gas, can maintain the NOx purification rate in the lean burn exhaust gas of internal combustion engine always at a prescribed level or above and thereby lowering the quantity of discharged harmful exhaust gas.
Inventors:
Toshio Manaka
Application Number:
JP22491099A
Publication Date:
January 26, 2005
Filing Date:
August 09, 1999
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
B01D53/94; B01J23/58; F01N3/08; F01N3/10; F01N3/20; F01N3/28; F02D41/02; (IPC1-7): F01N3/20; B01D53/94; B01J23/58; F01N3/08; F01N3/10; F01N3/28
Domestic Patent References:
| JP10212933A | ||||
| JP11013456A | ||||
| JP7279718A | ||||
| JP9317447A |
Attorney, Agent or Firm:
Yasuo Sakuta