Title:
EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3344040
Kind Code:
B2
Abstract:
PURPOSE: To set amounts of NOx and unburnt HC and Co which are discharged to the atmosphere to be at zero(0) level.
CONSTITUTION: Catalytic converter rhodium 17, catalytic oxidation 20, and NOx absorbers 23, 24 for absorbing NOx when the air-fuel ratio of exhaust gas which flows in is in lean condition, are arranged in an engine exhaust passage. Rich air mixture is burnt in an engine combustion chamber, and also secondary air is supplied upstream of the catalytic converter rhodium 17, and the air-fuel ratio of exhaust gas flowing in the catalytic converter rhodium 17 is set to be in an air-fuel ratio richer than the air-fuel ratio of air mixture which is burnt in a combustion chamber. The secondary air is supplied toward the upstream side of the catalytic oxidation 20, and the air-fuel ratio of exhaust gas which flows in the catalytic oxidation 20 and the NOx absorbers 23, 24 is set to be in such condition as slightly leaner than a theoretical air-fuel ratio.
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Inventors:
Hiroshi Tanaka
Takaaki Ito
Keiso Takeda
Hidemi Ohnaka
Kunitake Kunihisa
Toshio Tanahashi
Takaaki Ito
Keiso Takeda
Hidemi Ohnaka
Kunitake Kunihisa
Toshio Tanahashi
Application Number:
JP29526893A
Publication Date:
November 11, 2002
Filing Date:
November 25, 1993
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B01D53/86; B01D53/94; F01N3/08; F01N3/22; F01N3/24; F01N9/00; F02D35/00; F01N3/32; F01N13/02; (IPC1-7): F01N3/22; B01D53/86; B01D53/94; F01N3/08; F01N3/24
Domestic Patent References:
| JP544451A | ||||
| JP4362213A | ||||
| JP61250352A | ||||
| JP5219811A | ||||
| JP5036820A | ||||
| JP4915813A | ||||
| JP6243119U | ||||
| JP60127417U |
Other References:
【文献】国際公開93/7363(WO,A1)
Attorney, Agent or Firm:
Shoichi Ui (4 others)