Title:
EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2009228525
Kind Code:
A
Abstract:
To provide an exhaust emission control device of an internal combustion engine can surely capture and continuously eliminate SOx in exhaust gas irrespectively of temperature.
A pair of SOx trap catalysts 13, 14 is arranged in series in an engine exhaust passage along a flow of exhaust gas. When SOx should be discharged from the upstream SOx trap catalyst 13, an air-fuel ratio of exhaust gas flowing in the upstream SOx trap catalyst 13 is enriched and an air-fuel ratio of exhaust gas flowing in the downstream SOx trap catalyst 14 is kept lean by joining the exhaust gas of the rich air-fuel ratio flowing from the upstream SOx trap catalyst 13 at that time with exhaust gas of a lean air-fuel ratio flowing in a bypass flow path 29.
Inventors:
YOSHIDA KOHEI
ASANUMA TAKAMITSU
NISHIOKA HIROMASA
NAKATA YUKA
CHIBA KOICHIRO
ASANUMA TAKAMITSU
NISHIOKA HIROMASA
NAKATA YUKA
CHIBA KOICHIRO
Application Number:
JP2008073629A
Publication Date:
October 08, 2009
Filing Date:
March 21, 2008
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/20; B01D53/86; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/36; F02D41/04
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Yoryo Mihashi
Koichi Ito
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Yoryo Mihashi
Koichi Ito