Title:
EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3508703
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately sense a deterioration of NOX catalyst installed in the exhaust passage of a lean combustion type internal combustion engine.
SOLUTION: An exhaust emission control device of an internal combustion engine is equipped with a NOX catalyst of storage reduction type installed in the exhaust passage of the engine and an absorption and emission control means to drop the exhaust air-fuel ratio for regenerating the NOX absorbing ability of the catalyst, wherein the air-fuel ratio in the exhaust gas flowing into the catalyst is lowered from the case in which the NOX storage ability is regenerated temporarily, and deterioration of the catalyst is judged on the basis of the time in which the air-fuel ratio in the exhaust gas flowing out from the catalyst at this time of the ratio being lowered indicates a rich air-fuel ratio.
Inventors:
Harada, Yasuo
Ishiyama, Shinobu
Ishiyama, Shinobu
Application Number:
JP2000223059A
Publication Date:
March 22, 2004
Filing Date:
July 24, 2000
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F02D45/00; F01N3/08; F01N3/20; F01N3/28; (IPC1-7): F01N3/20; F01N3/08; F01N3/28; F02D45/00
Attorney, Agent or Firm:
遠山 勉 （外３名）
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