Title:
内燃機関の排気浄化装置
Document Type and Number:
Japanese Patent JP5776773
Kind Code:
B2
Abstract:
Provided is an exhaust purification system for an internal combustion engine. The exhaust purification system comprising: a NO X purifying catalyst arranged in an exhaust passage of the internal combustion engine, wherein the NO X purifying catalyst comprises a base metal supported on a catalyst support; an oxygen sensor arranged at the downstream side of the NO X purifying catalyst in the exhaust passage; and an air-fuel ratio control means for controlling the air-fuel ratio of exhaust gas flowing into the NO X purifying catalyst; wherein when the NO X purifying catalyst suffers from predetermined oxygen poisoning, the air-fuel ratio control means controls the air-fuel ratio of the exhaust gas, which flows into the NO X purifying catalyst, to a first air-fuel ratio wherein the first air-fuel ratio is richer than a theoretical air-fuel ratio, and then the air-fuel ratio control means switches the air-fuel ratio of the exhaust gas, which flows into the NO X purifying catalyst, to a second air-fuel ratio on the basis of an output value from the oxygen sensor wherein the second air-fuel ratio is leaner than the first air-fuel ratio.
Inventors:
Mayuko Osaki
Akashi Kazutori
Masao Watanabe
Shigeru Takagi
Nobukawa Ken
Akashi Kazutori
Masao Watanabe
Shigeru Takagi
Nobukawa Ken
Application Number:
JP2013524568A
Publication Date:
September 09, 2015
Filing Date:
December 16, 2011
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D41/04; B01J23/72; F01N3/20; F01N3/28; F01N3/30; F02D45/00
Domestic Patent References:
| JP2010185325A | ||||
| JP2003049681A | ||||
| JP2005537417A | ||||
| JP2010101310A | ||||
| JP2010249100A | ||||
| JP2006336614A | ||||
| JP2011098265A |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Nobuo Sekine
Yasuo Dogaki
Satoshi Deno
Takashi Ishida
Tetsuji Koga
Nobuo Sekine
Yasuo Dogaki
Satoshi Deno